Created with Highcharts 5.0.7YearNumber of sets it took Federer towin his first round matchTiafoe pushed Federer to five sets in first round of U.S. Open forthe first time since 2000Tiafoe pushed Federer to five sets in first round of U.S. Open for the first time since 2000________________________________________Space Filler Do Not TouchBY DYLAN SINN, DANIEL CHAVKIN, LINDSEY FEINGOLD and ADAMZIELONKA | CAPITAL NEWS SERVICESource: Capital News Service analysis of ATP data compiled by JeffSackman.Blank years indicate tournaments in which Federer did not play.5343333333333335Series 119992001200320052007200920112013201520170 Sets1 Sets2 Sets3 Sets4 Sets5 Sets6 Sets